I mean even professional businesses use social media and gifs. I mean, many top universities at least in the US has a professional team of people who posts memes and gifs. This is also true for large companies such as Taco Bell or McDonalds.
Posting gifs doesn't neccesarily make the aywas team less professionl, even in news posts, since its actually a tool businesses use to draw people's attention and be more engaging. It's called being relatable, and reaching out to your consumers in a more interesting form of communication. Also, Aywas' userbase is generally young people who use tumblr such as yourself anon, so using gifs are not unacceptable. I think that the Aywas staff knows the userbase they have quite well.