You can take from moderncvstylebanking.sty the parts in charge of formatting the title and use them in your .tex file with the casual style; to add your LinkedIn information you can use \social[linkedin]{john.doe}:
\documentclass[11pt,a4paper,sans]{moderncv}
\moderncvstyle{casual}
\moderncvcolor{blue}
\usepackage[scale=0.75]{geometry}
\makeatletter
% commands from moderncvstylebanking.sty to have the title
% from that style
\newcommand*{\maketitlesymbol}{%
{~~~{\rmfamily\textbullet}~~~}}% the \rmfamily is required to force Latin Modern fonts when using sans serif, as OMS/lmss/m/n is not defined and gets substituted by OMS/cmsy/m/n
% internal command to add an element to the footer
% it collects the elements in a temporary box, and checks when to flush the box
\newsavebox{\maketitlebox}%
\newsavebox{\maketitletempbox}%
\newlength{\maketitlewidth}%
\newlength{\maketitleboxwidth}%
\newif\if@firstmaketitleelement\@firstmaketitleelementtrue%
% adds an element to the maketitle, separated by maketitlesymbol
% usage: \addtomaketitle[maketitlesymbol]{element}
\newcommand*{\addtomaketitle}[2][\maketitlesymbol]{%
\if@firstmaketitleelement%
\savebox{\maketitletempbox}{\usebox{\maketitlebox}#2}%
\else%
\savebox{\maketitletempbox}{\usebox{\maketitlebox}#1#2}\fi%
\settowidth{\maketitleboxwidth}{\usebox{\maketitletempbox}}%
\ifnum\maketitleboxwidth<\maketitlewidth%
\savebox{\maketitlebox}{\usebox{\maketitletempbox}}%
\@firstmaketitleelementfalse%
\else%
\flushmaketitle{}\\%
\savebox{\maketitlebox}{#2}%
\savebox{\maketitletempbox}{#2}%
\settowidth{\maketitleboxwidth}{\usebox{\maketitlebox}}%
\@firstmaketitleelementfalse\fi}
% internal command to flush the maketitle
\newcommand*{\flushmaketitle}{%
\strut\usebox{\maketitlebox}%
\savebox{\maketitlebox}{}%
\savebox{\maketitletempbox}{}%
\setlength{\maketitleboxwidth}{0pt}}
\renewcommand*{\maketitle}{%
\setlength{\maketitlewidth}{0.8\textwidth}%
\hfil%
\parbox{\maketitlewidth}{%
\centering%
% name and title
\namestyle{\@firstname~\@lastname}%
\ifthenelse{\equal{\@title}{}}{}{\titlestyle{~|~\@title}}\\% \isundefined doesn't work on \@title, as LaTeX itself defines \@title (before it possibly gets redefined by \title)
% detailed information
\addressfont\color{color2}%
\ifthenelse{\isundefined{\@addressstreet}}{}{\addtomaketitle{\addresssymbol\@addressstreet}%
\ifthenelse{\equal{\@addresscity}{}}{}{\addtomaketitle[~--~]{\@addresscity}}% if \addresstreet is defined, \addresscity and \addresscountry will always be defined but could be empty
\ifthenelse{\equal{\@addresscountry}{}}{}{\addtomaketitle[~--~]{\@addresscountry}}%
\flushmaketitle\@firstmaketitleelementtrue\\}%
\collectionloop{phones}{% the key holds the phone type (=symbol command prefix), the item holds the number
\addtomaketitle{\csname\collectionloopkey phonesymbol\endcsname\collectionloopitem}}%
\ifthenelse{\isundefined{\@email}}{}{\addtomaketitle{\emailsymbol\emaillink{\@email}}}%
\ifthenelse{\isundefined{\@homepage}}{}{\addtomaketitle{\homepagesymbol\httplink{\@homepage}}}%
\collectionloop{socials}{% the key holds the social type (=symbol command prefix), the item holds the link
\addtomaketitle{\csname\collectionloopkey socialsymbol\endcsname\collectionloopitem}}%
\ifthenelse{\isundefined{\@extrainfo}}{}{\addtomaketitle{\@extrainfo}}%
\flushmaketitle}\\[2.5em]}% need to force a \par after this to avoid weird spacing bug at the first section if no blank line is left after \maketitle
\renewcommand*{\namefont}{\Huge\bfseries\upshape}
\renewcommand*{\titlefont}{\Huge\mdseries\upshape}
\renewcommand*{\addressfont}{\normalsize\mdseries\upshape}
\renewcommand*{\quotefont}{\large\slshape}
% styles
\renewcommand*{\namestyle}[1]{{\namefont\textcolor{color1}{#1}}}
\renewcommand*{\titlestyle}[1]{{\titlefont\textcolor{color2!85}{#1}}}
\renewcommand*{\addressstyle}[1]{{\addressfont\textcolor{color1}{#1}}}
\renewcommand*{\quotestyle}[1]{{\quotefont\textcolor{color1}{#1}}}
\renewcommand*{\makecvtitle}{%
% recompute lengths (in case we are switching from letter to resume, or vice versa)
\recomputecvlengths%
\maketitle%
% optional quote
\ifthenelse{\isundefined{\@quote}}%
{}%
{{\centering\begin{minipage}{\quotewidth}\centering\quotestyle{\@quote}\end{minipage}\\[2.5em]}}%
\par}% to avoid weird spacing bug at the first section if no blank line is left after \maketitle}
\makeatother
% personal data
\name{John}{Doe}
\title{The title}
\address{street and number}{postcode city}{country}
\phone[mobile]{+1~(234)~567~890}
\phone[fixed]{+2~(345)~678~901}
\phone[fax]{+3~(456)~789~012}
\email{john@doe.org}
\homepage{www.johndoe.com}
\social[linkedin]{john.doe}
\social[twitter]{jdoe}
\social[github]{jdoe}
\extrainfo{additional information}
\photo[64pt][0.4pt]{picture}
\quote{Some quote}
\begin{document}
\makecvtitle
\section{Education}
\cventry{year--year}{Degree}{Institution}{City}{\textit{Grade}}{Description}
\cventry{year--year}{Degree}{Institution}{City}{\textit{Grade}}{Description}
\section{Master thesis}
\cvitem{title}{\emph{Title}}
\cvitem{supervisors}{Supervisors}
\cvitem{description}{Short thesis abstract}
\section{Experience}
\subsection{Vocational}
\cventry{year--year}{Job title}{Employer}{City}{}{General description no longer than 1--2 lines.\newline{}%
Detailed achievements:%
\begin{itemize}%
\item Achievement 1;
\item Achievement 2, with sub-achievements:
\begin{itemize}%
\item Sub-achievement (a);
\item Sub-achievement (b), with sub-sub-achievements (don't do this!);
\begin{itemize}
\item Sub-sub-achievement i;
\item Sub-sub-achievement ii;
\item Sub-sub-achievement iii;
\end{itemize}
\item Sub-achievement (c);
\end{itemize}
\item Achievement 3.
\end{itemize}}
\cventry{year--year}{Job title}{Employer}{City}{}{Description line 1\newline{}Description line 2}
\end{document}
The output:
