Quote the source?

Hi Juliens,

Thanks for reaching out to the Adobe Stock team.

Yes, if you are using an unmodified Adobe Stock image(to illustrate the page facebook of your company) then a credit line to the photographer must be included. The credit line(photographer's name) which you should mention on the image should be "© [Photographer's Name] /Adobe Stock"

If you are using a modified image of Adobe Stock, the credit line becomes optional.

Note: If only the modifications are major, you do not need to add a credit.

Also, you may use the images for a logo only if it heavily modified.

You are not allowed to use an Adobe Stock image as a part of company logo/ brand because Adobe Stock only grants a right to use images and does not transfer the ownership, these images cannot be used in or as a logo.

For more information on the licensing terms, please go through Stock Licensing & terms FAQ: Where can I find the terms and licensing information for Adobe Stock? and  Common Questions, Adobe Stock

Hope this information helps!

Feel free to update this thread in case of any additional questions.

Regards,

Twarita