You have both the moral and legal right to do so, even if the attacker is only threatening you and hasn’t struck first. However, it is important to understand that there can be significant drawbacks to its use.
Some sites provide free registration, but may offer services which require a monthly fee.
Other sites depend on advertising for their revenue.
Most sites allow members to upload photos or videos of themselves and browse the photos and videos of others.
Sites may offer additional services, such as webcasts, online chat, telephone chat (VOIP), and message boards.
Surprisingly, 15-20% of people will not be incapacitated even by a full-face spray.