In order to discourage bad use of this service, we started (since 23.3.2016) to calculate the quality of each Wall.
Walls with a low quality are penalized (currently: displaying a little ad banner).
If you want that your profile has a good quality rank, you should follow these suggestions:
1) don't leave your Wall empty. Walls with only empty blocks, or with few used blocks, will be ranked as low quality.
2) don't use too many "Personal web" blocks. If percentage of "Personal web" blocks is too high, quality rate is lower. Don't use a "Personal web" block to link to a supported social network (like Facebook, Instagram, etc.).
3) customize your background image: this will give an higher quality rate
4) customize your Country: this will give you an extra quality bonus