Regarding the first chart:
- Mars, significator of other people is in 11th house of social networking, is partile squared by Venus, significator of querent, suggesting your vulnerability to the misuse of other people's will
- Venus, significator of querent, in Scorpio, sign of power and secrecy, suggesting querent is overly suspicious, but also may be vulnerable to manipulation and hacking
- Sun, significator of 11th house of social networking applies to opposition to Uranus, ruler of technology and social networking, and co-significator of 5th house of romantic interests
- Sun, significator of 11th house of social networking, falls in Libra, ruling sign of querent, and is squared by Moon, co-significator of querent.
- Sun (significator of social networking), Moon (querent co-significator), Uranus (social networking, technology, and hacking) and Pluto (power abuse) are in a Grand Square suggesting hacking is a real possibility
- Uranus, ruler of social networking and hacking is in 7th house (whole house system), suggesting someone may have hacked in.
- Part of rectitude at 17 Leo in 11th house of social networking, conjunct Mars, suggesting you are right about the motives of others with regards to your Facebook account.
So overall, the chart suggests your suspicions have validity. In particular, the Venus-Mars partile square suggests some kind of violation (such as hacking) has taken place in relation to your question. As regards to who, Mars is the significator of other people, suggesting the person you most have in mind, and as 7th house in general rules relationships, this could be a romantic interest. As to why, Mars and Venus in square suggest some conflict, whether inner or outer, is going on with you for the other person.
However, in astrology there are no absolutes, so I can not give you proof. That would be found in Facebook security logs held on the Facebook servers.