Some of the examples are outrageous and I wouldn't suggest taking everything to heart. Anyhoo, there are some ways of achieving rib I thought I'd pass on.
First, Back Loop double crochet. Measure the height of the rib section you wish to crochet and chain the number equivalent to this plus one. Dc into 2nd ch from hook and dc to end; ch 1, turn. Dc into the back loop of each dc to end. Continue in this manner on each row until piece is the desired width or length of your project. You'll achieve a sort of 'train track' effect.
Another method is to use front and back post trebles across the width of the piece to achieve a raised rib. Basket weave is another texture which combines back loop and post stitches. Check it out.