I have not seen this myself, I tend to ride in the country and rarely see groups of cyclists outside of the first few miles in a club ride

A co-worker asked me about something she has seen in downtown Indy, twice. There were several groups of cyclists out riding and several where holding/supporting the shoulders of another cyclist with their hand. Apparently they were riding like this, and she saw this multiple times that morning around the downtown area. One cyclist riding with one hand on another's shoulder - and apparently several in each group were doing this.

So she asked me "wazzup with that?" I don't know, so am asking her so I can pass along the info