Fake Invite Google Plus

Be careful with the invitation Palus google plus, many attackers use this moment for pishing.
What should you do when receiving an email invite to join google plus?

1. See who sent the invitation. Did you know? if you do not know just ignore it
   
2. Consider sending email invitations. Real Invitation from google will use domain from google like this @plus.google.com and from other of that domain, certainly fake
3. Never click  link provided in the email invitation before you check at point 1 and 2
4. place for signup google plus just in http://plus.google.com or http://google.com/plus or the official domain of google. Maybe this different for every country, for example in Indonesia google domain has with Indonesian domain like http://google.co.id not with dotcom anymore, but if we would like access google with english we can use google.com because dotcom is a general domain off google