What does # followed by a word or phrase mean on Facebook? What about random numbers like ~92461~?

[Grasshopper]

I've seen #stupid and #whatever. Are these used as a summarizing statement?

[Macie]

The # (pound) sign is called a "hashtag". Hashtags are used by twitter community. They use it to add additional context and metadata their tweets. They are like tags on Flickr. You create a hashtag by the "#" prefix before a word within your tweet. Hashtags were developed as a means to create "Groupings" On twitter.. So it probably is something that is from twitter.. (= hope i helped