Lots of noise this week in social media circles about Mastodon.  Founded by a 24-year old in Germany it's free of advertising and asks participants to respect a set of guidelines prohibiting racism, sexism, discrimination against gender and sexual minorities, xenophobia and/or violent nationalism.

 If you wonder what all the talk is about, the bad news is that new sign-ups were barred last week following an influx of new users.

It's reported that the site has 42,000 users which would make it tiny against the 320 million or so Twitter users. Still - it's early days, time will tell whether Mastodon is a stayer.