"Ο θείος μου έχει μπλοκάρει τις διαφημίσεις."

Translation: My uncle has blocked the advertisements.

[Speugenia]

"advert(s)" is a valid short term for "advertisement(s)" everybody uses and should be accepted as an alternate, real life translation I believe.

[ChrysiCh.]

Exactly, and so is "ad(s)". You can also find both of these abbreviations in the Oxford Dictionaries. They should both be accepted.

[Stergi3]

Yes, I think so too.

[JAGascon]

Reported.

[Theo_Matrakas]

Added :)