wants to chat - what’s the story behind these posts

Yesterday I saw a similar post in gwt forum from my account (which I
didn't post)
I thought my account is compromised, I deleted that post and changed
my password.
But nothing else looked suspicious but just one post in gwt forum.
Message itself looks bit promotional from google team.
Today, I searched and saw few other such posts i.e.
http://groups.google.com/group/google-web-toolkit/browse_thread/thread/90eb36971c744756/31d5407614cae4a1?lnk=gst&q=wants+to+chat#31d5407614cae4a1
http://groups.google.com/group/google-web-toolkit/browse_thread/thread/fbad184e51a5c45a/71c546c41077d307?lnk=gst&q=wants+to+chat#71c546c41077d307
Are accounts been hacked or some other problem?

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