It does not matter what size the monitor is. What matters is the resolution the operating system (Windows) is set at.
You set the
monitor to a particular resolution on Windows computers
using the display setup tools or the video card software.
Most of us now have displays that are 17" or greater in diagonal
measurement and run XGA (1024x768) or SXGA (1280x1024) resolution.
There are some mighty big monitors out there now, for very low prices.
I run a 4:3 aspect ratio 19" monitor at SXGA resolution and the pix I post
fill a very good portion of the screen at native resolution. A good picture
editor will allow some control over the compression features of JPG images,
so a fairly large photo at native resolution on a 19" SXGA monitor can be
well under 100KB. I usually go for about 900x900 pixels. This photo is
1050x489, but is only 52KB. I have reduced the compression to its
lowest level using Adobe Photoshop Elements 7. Clearly, what I do
would not be acceptable for decent prints, but I virtually never print
any photos (and I do save the originals in case I want them later).
As for the best place to post photos, I am not a fan of the free posting sites,
though many people use them. The problem is more than just the ads.
The terms of "free" use can change at any time, and your photos will be
deleted after some period of not accessing them. I think Photobkt is 3
months, but I have not checked lately. The best place could be your own
web space, provided by your ISP. But not if you frequently change ISPs.
TBN has been around a long time, and no forum I use provides better
photo posting tools. I have been a lurker at TBN since 2000, and a poster
since 2004. I think TBN will be around for a while. Other forums have
no way to upload your own photos...you are often forced to link them to
some website where they are posted. My current ISP, Verizon,
provides 5MB of space for free, and web-based upload/editing tools. For
more space, I could pay a fee. I once had web pages on AOL's "hometown",
but they were all deleted when that service went away.