textiversary 

The yearly celebration or commemoration of the first exchange of texts between two people.

Lisa: you know our textiversary is coming up, right??
Missy: Ooo of course! Last Halloween was when you became my text ho!! How could I forget?!

textiversary by BigMissy September 9, 2010

textiversary 

The anniversary between two individuals that begun texting one another. This can be temporal or numerical.

"You know, this is our 600th text to one another. Happy textiversary!"

"We started texting each other exactly one year ago. Happy textiversary."

textiversary by cidrobin March 1, 2010

Tweetiversary 

The milestone of a certain amount of tweets a person has posted on twitter. This is usually every hundred tweets.

"I forgot my 200th tweetiversary, so I'm looking forward to my 250th"

Tweetiversary by Kiss_Fan February 4, 2010