Blurry parts of the picture

Hey I made a cover for facebook and at first everything was fine but an hour ago I uploaded the pic to a friend on chat and some parts were blurry. I have a photo and some circles, triangles and a logo on it. Circles, triangles and the logo seem to be blurry or I dunno like it's a bad quality. The background picture is fine but other objects are not. It's a jpeg, I worked with RGB colors. I really need help with this one. Also when I view the photo on my pc (offline) it's perfect but as soon as I upload it those parts get blurry.

the reason that is blurry because you edit the image lower dpi (I guest).
Create a new file in Photoshop with 300 dpi, then import the image and add the other object!
Hopefully, this helps.