For me comments and favourites is the bread and butter of how Redbubble works, I will try to explain.
If you do a search for a work of art, for instance ‘sunset’ the results you are given are sorted by the most popular first. How do Redbubble decide what the most popular images are? It seems that the number of favouritings, comments and views are what is used and the weighting seems to be that a Favourite is worth more than a comment and a view, which would make sense.
If you check the Most popular artworks, you can find them by clicking ART – POPULAR and selecting RANGE for example ALL TIME this will show you the best images on Redbubble EVER, my work Into the Shadows is in the top 250 of all time in this list (just thought I would mention that) or click here ALL TIME LIST
As you may be aware I do not use the reply button (we didnt have one in the old days) because I would prefer to spend my time looking at my friends and supporters artwork and leaving comments and favourites as I see fit, this promotes their art through the most popular, searches and the image also appears in ALL my friends image feeds much like me advertising their work.
If I have got this wrong I would be grateful if somebody lets me know! Maybe if we bribe the redbubble staff with chocolate we might hit number 1 in all the searches lol.