[theandrewbailey]

Feels like late 2000s to very early 2010s. And note that it was never -er, the -r was invariably preceded by a consonant. Thankfully, subsequent naming schemes stopped disemvoweling words.

[Tronno]

Not quite "never": e.g. Napster

[dmix]

I think they mean -r as in Tumblr

[vintagedave]

Innocent times. I miss this period of the internet.

[red-iron-pine]

grindr, vultr, gettr, et al