figure8-10-a-social-networks-data.tex

\documentclass[border=0.2cm]{standalone}

\usepackage{tikz}
\usetikzlibrary{shapes.geometric, shapes.misc}
\usetikzlibrary{cd, fit, calc}
\usetikzlibrary{positioning}
\usepackage{medl_colors}

\begin{document}
\begin{tikzpicture}

\node at (0,0)[lightblueshape,circle,minimum size=15mm, align=center,font=\small] (node1) {Emily};
\node [lightblueshape,circle,minimum size=15mm, align=center,font=\small,right of=node1, yshift=0.75cm,node distance = 4cm] (node2) {Kayley};
\node [lightblueshape,circle,minimum size=15mm, align=center,font=\small,above of=node1, xshift=0.75cm,node distance = 3cm] (node3) {Yarden};
\node [lightblueshape,circle,minimum size=15mm, align=center,font=\small,below of=node1, xshift=2cm,node distance = 2cm] (node4) {Adaya};

\draw [dashed,thickline](node1) -- (-2,-1);
\draw [dashed,thickline](node1) -- (-1,2);
\draw [thickline](node3) -- (node2) -- (node4) -- (node3) --  (node1);
\draw [dashed,thickline](node2) -- (5,2);
\draw [dashed,thickline](node2) -- (5,0.25);
\draw [dashed,thickline](node3) -- (2,4);
\draw [dashed,thickline](node3) -- (-1,4);
\draw [dashed,thickline](node4) -- (3,-3);
\draw [dashed,thickline](node4) -- (1,-2);
\draw [dashed,thickline](node4) -- (2,-3);
\draw [dashed, thickline](node2)--(node1)node[midway,above]{\textbf{?}}--(node4)node[midway,above]{\textbf{?}};

\end{tikzpicture}
\end{document}