He also posted two very specific comm type pictures on twitter during that time that were both deleted. One was a visual paradox that didn't make sense with a water glass and plate, the other he drew a hangman in his jam on his toast. Both were somewhat promptly deleted.

Also, there was chatter on other celebrities accounts using the Woody doll (from Toy Story) implying that Wood/Tom was killed/dead.

I believe this whole thing is documented on the "decoding symbols" website.