Ads on fb changed from English to Greek?

[ㄅ4и∂Я4ﾉ4и∑]

I'm not that IT literate, so excuse me if the reason for this happening seems ridiculous but the above has only started since this event. A Greek friend living in Australia emailed me via hotmail with a YouTube type little video, I watched it and since then all the ads on the right side of my fb page have turned into Greek! although my language setting is English

Also when fb asked if you've watched certain, films, tv programmes and books its all Greek films, books etc.

I've asked around but everyone is stumped as to why it's happened or how I can correct it?
Stevo went there and language is still set to "English"