1.0 link Rainbow Dash Network http://rainbowdash.net/ Cerulean Spark (ceruleanspark) http://rainbowdash.net/ceruleanspark http://rainbowdash.net/notice/3741117 @<span class="vcard"><a href="http://rainbowdash.net/user/31387" class="url" title="Bubba Lewi Nighthawk"><span class="fn nickname mention">rainlightsparkledash</span></a></span> I think you have to finish the tutorial and get to the tower first, but other than that, you can invite anyone on your friends list to join you at any time.