Position	Website	Change	Thumbnail
1	planetpdf.com - Planet PDF - The PDF User Community - Nitro PDF Software The most comprehensive, popular and independent site focused on Adobe Acrobat/PDF. Sponsored by Nitro PDF, ARTS PDF, PDFlib and more.	0
2	en.wikipedia.org - Wikipedia, the free encyclopedia	1
3	commonlook.com - CommonLook Document Accessibility Software & Services - Welcome We help organizations ensure their electronic documents are accessible and comply with applicable regulations such as Section 508 and WCAG 2.0.	5
4	stackoverflow.com - Stack Overflow	0
5	podofo.sourceforge.net - PoDoFo	9
6	superuser.com - Super User	1
7	help.adobe.com - Adobe - Help Resource Center	-5
8	gnupdf.org - GNUpdf	-3
9	resources.infosecinstitute.com	0
10	quickpdf.org - Quick PDF Library - 100% Royalty-Free PDF Developer SDK - Community Forum - QuickPDF.org	-4
11	w3.org - World Wide Web Consortium (W3C) The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to devel...	1
12	blog.idrsolutions.com - Java PDF Blog | PDF tips and JPedal highlights PDF tips and JPedal highlights	9
13	blog.didierstevens.com - Didier Stevens	12
14	72.52.242.182 - Acrobat Answers	0
15	pdfclown.wordpress.com - PDF Clown's Blog Developing a free/libre open source PDF library	0

I have no idea. Please, refresh tomorrow ;)

Site	Traffic	Engagement
planetpdf.com	67%	0x
wikipedia.org	9.7%	0x
sourceforge.net	5.1%	0x
superuser.com	3.7%	0x
adobe.com	3%	0x
Other	11.5%	0x

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Twitter activity