We are seeing very intense and concentrated tweeting right now from Plaça de Catalunya, Barcelona, Spain, which is a protest site for the ongoing protest movement.
Using the high level tweeting meter we see an extremely concentrated number of tweets coming from the site which confirm reports of a massive protests confronted by police today.
Also we are seeing extremely high tweeting coming from the site of an evolving protest in Madrid.
Update May 28th: this morning we say a high density tweet reading from the Barcelona protest site of 94, which would indicate a large crowd of heavy web users remains collected in that area. The high density reading functions at the near smallest reliable limit of GPS, and therefore we are confident that the square remains crowded.