Google Invitation Spam

I received this invitation to open a gmail account. The problem is, I do NOT know who invites me. The id is cometure2005. Weird id, weird name. Why does this person send to my gmail account an invitation to open another gmail account? I decided it is a spam, and sent it directly to trash bin.

Not sure how often I'll get something like this. Now the MSN spam is daily encounters. Actually it is on login basis. Every time I log in to MSN, I get 4 popup windows to request to add me. Been thinking of setting up new MSN accounts actually. Now with this gmail spam? I've started to worry.