Here are Google + images and specifications:

Profile Picture: 250 x 250 (Recommended)

Image Guidelines

  • Minimum 250 x 250 pixels.
  • Recommended to use larger photos.
  • Maximum file size 100MB.
  • Maximum dimensions not listed (we were able to upload at 5,200 x 5,300 pixels).
  • Image types include: JPG, GIF or PNG.

 

Cover Image: 1,080 x 608

Image Guidelines

  • Recommended 1,080 x 608 pixels.
  • Minimum 480 x 270 pixels.
  • Maximum 2,120 x 1,192 pixels.

Shared Image – 497 x 373 (displays as)

Image Guidelines

  • Appears in home stream and on page at a width of 426 pixels (height is scaled).
  • Minimum width of 497 pixels (will scale the height for you).
  • Maximum upload 2,048 x 2,048 pixels.
  • Shared Link – 150 x 150 (thumbnail).

Shared Link – 150 x 150 (Thumbnail)

Image Guidelines

Shows in the feed and on page as 150 x 150 pixels (pulls in photo from linked site).

Shared Video: Width of 496 Pixels

Video Guidelines

  • Shows in the feed and on page as 497 x 279 pixels.