To fong something means to post it on social media and then delete it.
The usage of this word comes from the social media behavior of Gary Fong, a "rockstar" of the photography world and the creator of a line of photography products, such as the Gary Fong Puffer (a device to soften your on camera flash). He is known for weighing in on a variety of topics from the photography world to the economy. He frequently posts status updates on Facebook or posts comments on Twitter, which mysteriously disappear after a short period of time (from a few hours to a few days.)
Jody: "Did you see that status update Jane posted last night? She really slammed Dave's behavior."
Mary: "It seems to be gone now. She must have fonged it."
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