What are the community recommendations for the meta data logo used in XF 2.1? Size? Transparent or not? etc. Who uses it? I saved the web site to my iPhone home screen and it has a black background so obviously transparent is not good but I may need to add something specific for this use and not change the meta data logo? How about Facebook and Twitter or other networking sites? Are they using this and if so what dimensions and image specs are they requiring? In the end, how can I provide the best image assets for the various uses?