That is an interesting comparison between 2 similar companies. It would seem that LNKD might have already made a short term top and FB is probably yet to make an equivalent top. Sp from that perspective, the former could be preferred short. but it is only a short term pull back, which FB will experience soon too. The ideal longer term short would be upon completion of next leg higher wave 5 on my chart. In the meantime I would say safer trade is long on pull back, then consider short at appropriate time upon next leg higher. Here are both charts.