I just received an unsolicited email "Join Fabric at Google I/O", I clicked "Unsubscribe" without thinking, and it tries to send me to https://app.tweet.twitter.com/e/u?s=1259914507&elq=0fb5bc6fd9fc43d7b5c6deab6b32130a which looks trustworthy but gets blocked by Firefox as "This Connection is Untrusted"... am I paranoiac, or could this be an elaborate infection attempt?
[by the way: would this be on-topic as a question?]